Elatine brachysperma |
Elatine minima |
|
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short-seed waterwort |
small waterwort, élatine naine |
|
Habit | Herbs, submersed or emersed on wet substrates, 0.5–3(–5) cm. | Herbs, submersed or emersed on wet substrates, 0.2–3(–10) cm. |
Stems | ascending or prostrate, branched. |
erect or ascending, usually unbranched, sometimes 1–2 branched. |
Leaves | reddish green; stipules lanceolate, 0.5–0.6 mm, margins dentate, apex acute; petiole (0–)1–3 mm; blade narrowly oblong to ovate, 3–8 × 1–3 mm, base cuneate to rounded, apex rounded to obtuse. |
green; stipules lanceolate, 0.2 mm, margins entire, apex rounded; petiole 0–1 mm; blade elliptic to oblanceolate or spatulate, 0.3–5(–11) × 0.7–1.8(–4) mm, base rounded to truncate, apex obtuse-acute. |
Pedicels | 0–0.4 mm, erect. |
0–0.2 mm, erect. |
Flowers | sepals (2–)3, equal, oblong-ovate, 1.1–1.3 × 0.3 mm; petals 3, pinkish, elliptic or ovate, 1–1.5 × 0.5 mm; stamens 3; styles 3. |
cleistogamous when submersed; sepals 2, equal, ovate to oblong, 0.5 × 0.3 mm; petals 2, reddish, long-elliptic, elliptic, or ovate, 1–1.5 × 0.5 mm; stamens 2; styles 2. |
Capsules | globose, 3-locular, 1.1–1.7 mm diam. |
oblong-ovoid, 2-locular, 0.9–1.5 mm diam. |
Seeds | (6–)10–15 per locule, oblong, straight or curved to 30°, 0.3–0.5 × 0.1–0.3 mm; pits ± round, length 1–2 times width, in 6(–8) rows, (9–)14–17 per row. |
4–9 per locule, thickly cylindric to barrel-shaped, straight, 0.4–0.5(–0.7) × 0.2(–0.3) mm; pits elliptic, length 1.2–1.6 times width, in 8–9 rows, (11–)15–20 per row. |
Elatine brachysperma |
Elatine minima |
|
Phenology | Flowering summer–early fall. | Flowering summer. |
Habitat | Muddy shores, often of ponds or reservoirs. | Shores (sometimes intertidal) or in water to 2 m deep, sandy substrates mixed with organic debris, abandoned sunfish nests. |
Elevation | 0–1500(–2200) m. (0–4900(–7200) ft.) | 0–400 m. (0–1300 ft.) |
Distribution |
AL; AZ; CA; GA; IL; LA; MT; NE; NM; NV; OH; OK; OR; TX; WA; WY; BC; Mexico (Baja California); South America (Argentina)
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CT; DE; IL; MA; MD; ME; MI; MN; NC; NH; NJ; NY; PA; RI; SC; TN; VA; VT; WI; NB; NL; NS; ON; PE; QC; SK; SPM
|
Source | FNA vol. 12, p. 353. | FNA vol. 12, p. 353. |
Parent taxa | Elatinaceae > Elatine | Elatinaceae > Elatine |
Sibling taxa | ||
Synonyms | Alsinastrum brachyspermum, E. obovata, E. triandra var. brachysperma, E. triandra var. obovata, Potamopitys brachysperma | Crypta minima |
Name authority | A. Gray: Proc. Amer. Acad. Arts 13: 361, 363. (1878) | (Nuttall) Fischer & C. A. Meyer: Linnaea 10: 73. (1835) |
Web links |